I had a problem with red slime as well and had to repositon my powerheads to fix a few circulation dead spots. I read on wetwebmedia that poor lighting, poor water conditions or lack of circulation could be the cause so I fixed all 3 by adding some matal halides and did weekly water changes as well. It's gone for now and hopefully doesn't come back. 
		
	
		
		
		
		
		
	
		
			
			
			
			
			
			
			
			
			
				
			
			
		 
		
	
	
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